Double-pressure pump-governor.



W. V. TURNER.

DOUBLE PRRSSURBPUMP GOVERNOR.

APPLICATION FILED APB. 11, 1911.

1,074,224. Patented Sept' 30,1913.

, nl' l. z A k n WW COLUMBIA PLANDGRAPH co.. WASHINGTON, D. C.

UNITED STATES PATENT OFFICE.

WALTER V. TURNER, 0F EDGEW'OOD, PENNSYLVANIA, ASSIGNOR TO THE WESTING-HOUSE AIR BRAKE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

DOUBLE-PRESSURE PUMP-GOVERNOR.

To all whom t may concern.'

Be it known that I, WALTER V. TURNER, a citizen of the United States,residing at Edgewood, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements inDouble-Pressure Pump-Governors, of which the follow ing is aspecification.

This invention relates to pump governors adapted to operate at a minimumand maximum degree of pump pressure for respectively cutting the pumpinto and out of action.

lVhere equipment is employed in different classes of service, such aspassenger and freight service, different maximum and minimum degrees ofpressure may be desired for one class of service than is required in theother class of service, and the principal object of my invention is toprovide means for controlling the pump at one time according to onedegree oi' maximum and minimum pump pressure and at another timeaccording to a diierent degree of maximum and minimum pump pressure, thebroad invention being covered in by copending appli cation, Serial No.620,471, iiled April 11, 1911.

In the accompanying drawing, Figure 1 is a sectional view of an electricpump governor, with my improvement applied thereto and Fig. 2 a detailview of the controlling cock.

While the particular pump governor shown in the drawing is known as theJ type, such as covered in my prior Patent No. 879,699, dated February18, 1908, it will be understood that my improvement may be employed inconnection with various other types of pump governors.

According to Fig. 17 the pump governor 1 may comprise a casing, a switch2 for controlling the pump motor circuit, a piston 3 :tor actuating theswitch, a valve mechanism 4 for controlling the admission and release ofliuid to and from the switch piston 3, a maximum pressure regulatingvalve device 5, subject to the opposing pressures of an adjustablespring 6 and the pump pressure, and a minimum pressure regulating valvedevice 7, subject to the opposing pressures of an adjustable spring 8and the pump pressure.

The valve mechanism 4 comprises two pis- Specification of LettersPatent.

Application filed April 11, 1911.

Patented Sept. 30,1913.

Serial No. 620,472.

ton heads 9 and 10 for operating the valve 1l which controls theadmission and release of fluid to and from the switch piston 3 and theregulating valve device 5 is adapted when the pump pressure increases tothe predetermined maximum degree to vent fluid from the piston head 9and thereby operate the valve 11 to supply liuid to the switch piston 3,said piston being thereupon actuated to open the pump motor switch 2.l/Vhen the pump pressure decreases to the predetermined minimum degree,the regu lating valve device 7 operates to vent air from the piston head10, thereby actuating the valve 11 to release fluid .from the switchpiston 2 and cause the spring 12 to close the switch 2. Fluid forcontrolling the operation of the pump governor is supplied thereto byway of a pipe 13 which is connected to the reservoir or receptacle intowhich the pump compresses fluid.

According to my improvement, a valve mechanism is provided comprising acasing 14 having a pipe 15 connected to the pump reservoir pipe 13 and apipe 16 connected to a cont-rolling cock 17 located in the pipe 13.

Within the casing 14 is mounted a valvedevice comprising a valve 18 andconnected piston heads 19 and 20 for operating said valve. The valvechamber 21 intermediate the piston heads 19 and 2O is in opencommunication through passage 22 with pipe 15 and chamber 23 adjacentthe outer face of piston head 19 is connected by passage 24 to a chamber25 controlled by a regulating valve 26. The piston chamber' 27 at theouter facevof piston head 2O is connected to passage 28 controlled by aregulating valve 30.

The regulating valve 26 is operated by a movable diaphragm 31, subjecton one side to the pressure of an adjustable spring 32 and on theopposite side to pump pressure supplied thereto through a passage 33.

The regulating valve 30 is controlled by a movable diaphragm 34, subjecton one side to the pressure of an adjustable spring 35 and on theopposite side to pump pressure supplied thereto through a passage 36.

In operation, with the controlling cock 17 in the position shown in Fig.1, fluid at pump pressure is supplied through the port 37 to the pumpgovernor and said governor is then operated in the usual manneraccording to the maximum and minimum degrees of pump pressure for whichthe regul'ating valve devices 5 and T may be adjusted.

if it is desired to regulate the pump pressure according to a differentmaximum and minimum degree, the controlling cock 17 is turned to theposition shown in Fig. 2, in which the reservoir side of pipe 13 is cutoff from the governor' and the pipe 16 is connected to the governor sideof the pipe 13.

By way of example, assume that the maximum and minimum regulatingpressures of the main pump governor 1 are 100 pounds and 85 poundsrespectively and that the higher maximum and minimum pressures desiredare 140 and 125 pounds respectively, then the maximum regulating spring32 is adjusted at 140 pounds and the minimum regulating spring 35 isadjusted at 125 pounds.

rEhe operation will now be as follows: YWith the valve 18 in theposition shown in Fig. 1, cavity 37 connects passage 38, leading to pipe16, with an exhaust port 39, so that there is no fluid pressure on theregulating valve devices of the governor 1 and the switch 2 is thereforecut in and the pump operates to compress fluid. Then the pump pressurehas increased to 140 pounds at which the maximum regulating spring 32 isadjusted, the diaphragm 31 operates the valve 26 and fluid is ventedfrom piston chamber 23 through the passage 24. The piston heads 19 and2O being provided with equalizing ports for permitting fluid to equalizefrom the valve chamber 2,1 to the piston chambers 23 and 27, the Huidpressure in piston chamloel1 27 will now be unbalanced and thecontrolling valve device thereupon shifted so that. the valve 18uncovers passage 38 and permits fluid to flow to pipe 16 and thencethrough pipe 13 to the pump governor 1. rEhe fluid at high pressure thusadmitted to the regulating valve device 5 promptly operates the same tothereby vent fluid from the piston head 9, so that the valve 11 isactuated to supply fluid to the switch piston 3. Said switch piston thenopens the switch 2 and stops the pump. lWhen the pump pressure falls tothe minimum pressure of 125 pounds, at which the regulating spring 35 isadjusted, the valve 30 is actuated by the diaphragm 34 to vent fluidfrom the piston head 2O through the passage 28, and the valve 26 beingclosed at thispressure, the fluid previously equalized into the chamber23 operates the piston 19, and the valve 18 is shifted to its positionfor connecting the passage 38 with exhaust port 39. Fluid is thus ventedfrom the pipe 13 and the diaphragme of the regulating devices 5 and 7,so that the passage for venting fiuid from piston 9 is closed by theregulating valve ydevice 5, while the regulating valve. device 7operates to vent fluid from the piston head 10. The fluid pressure onthe piston head 9 then operates the valve mechanism 4 and the valve 11is shifted to the position for venting fluid from the switch piston Therelease of fluid fromsaid piston thereupon permits the spring 12 toshift the same and close the switch 2`so as to cut the pump intoact-ion. It will now be evident that when the coclr'l is Y'turned to oneposition'fluid at pump pressure is admitted to the governor 1 and thelatter then operates in the usual manner to control the pump, but whenthe cock 17 is turned to its other position, the valve mechanism 14 iseffective to control the pump according to the higher maximum andminimum pressures for which the same is adjusted.

Having now described my invention, what l claim as new and desire tosecure Letters Patent is 1. The combination with a Junin 0overnornormally operating at a predetermined maximum degree of pump pressurefor cutting the pump out of action and at a predetermined minimum degreeof pump pressure for cutting the pump into action, of a valve mechanismoperating at higher maximum and minimum pump pressures for controllingthe supply of operating fluid to said governor to thereby cause thegovernor ,to operate at predetermined maximum and minimum degrees ofpump pressure higher than the normal.

2. The combination with a pump governor comprising a pump controllingdevice and a valve mechanism operating at a predetermined maximum degreeof pump pressure for actuating said controlling device to cut the pumpout of action and at a predetermined minimum degree of pump pressure forcutting the pump into action, of a valve mechanism operating at highermaximum and minimum degrees of pump pressure and `adapted to be cut. infor controlling the pump governor valve mechanism to thereby cause thepump controlling device to operate at higher maximum and minimumdegreesI of pump pressures 3. The combination with a pump governoradapted at a predetermined maximum degree of pump pressure to cut thepump out of action and at a predetermined minimum degree of pumppressure to cut the pump into action, of a valve mechanism operating ata higher maximum degree of'pump pressure to supply operating Huid toeffect the operation ofthe pump governor at said higher maximum pressureand operating at a higher minimum degree of pump pressure to releasefluid from said governor to effect the operation thereof at said higherminimum degree of pump pressure.

4. The combination with a pump governor adapted at a predeterminedmaximum degree of pump pressure to cut the pump out of action and at apredetermined minimum degree of pump pressure to out the pump intoaction, of a valve mechanism for controlling said pump governoraccording to a higher maximum and minimum degree of pump pressure,comprising a Valve for supplying and releasing fluid to and from saidpump governor, a piston device for operating said valve, a maximumpressure regulating device governed by the pump pressure and a minimumpressure regulating device governed by the pump pressure for controllingthe operation of said piston device.

5. The combination with a pump governor adapted at a predeterminedmaximum degree of pump pressure to cut t-he pump out of action and at apredetermined minimum degree of pump pressure to cut the pump intoaction, of a valve mechanism operating according to a higher degree ofmaximum and minimum pump pressure for controlling the admission andrelease of fluid to and from said pump governor, and a cock adaptedinone position to supply fluid at pump pressure to said pump governor andin another position to open communication from said valve mechanism forsupplying and releasing fluid to and from the pump governor.

6. The combination With a pump governor normally operated by fluid at apredetermined maximum degree of pump pressure to cut the pump out ofaction and at a predetermined minimum degree of pump pressure to out thepump into action, of a valve mechanism operated at higher predetermineddegrees of maximum and minimum pump pressures for also controlling thesupply of operating fluid to said governor.

7. The combination with a pump governor normally operated by fluid at apredetermined maximum degree of pump pressure to cut the pump out ofaction and at a predetermined minimum degree of pump pressure to cut thepump into action, of a valve mechanism operated at higher predetermineddegrees of maximum and minimum pump pressures for also controlling thesupply of operating fluid to said governor, and a cock adapted in oneposition to connect said governor directly with fluid at pump pressureand in another position to said valve mechanism.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER.

Witnesses A. M. CLEMENTS, .,Q.. W. KEEFER` Copies of this patent may beobtained for ve cents each, by addressing the Commissioner of Patents,Washington, D. C.

